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Definitions

circadian

[sur-key-dee-uhn] / sɜrˈkeɪ di ən /


Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

The study, carried out with Mia Morrell, an NYU graduate student, and Leela Elliott, an NYU undergraduate, may also help scientists better understand biological timing systems such as circadian rhythms.

From Science Daily • Mar. 22, 2026

However, sleep scientists and medical groups generally argue in favor of permanent standard time, saying it better aligns with human circadian rhythms and reduces health risks.

From Los Angeles Times • Mar. 7, 2026

“I’ve noticed it makes me very low energy because my circadian rhythm relies on the sunrise to really wake up,” said Hannah M. Le, founder of Buckle Scrunchies, a hair-tie brand.

From MarketWatch • Mar. 6, 2026

Robertson says light pollution is increasing, which affects human circadian rhythms, and the lives of other species.

From BBC • Feb. 28, 2026

Called the circadian rhythm, this clock is geared to the place where you have been living recently.

From "Flying to the Moon: An Astronaut's Story" by Michael Collins




Vocabulary lists containing circadian